REPARTI Seminars

The CerVIM Seminars, Université Laval are held on Fridays at 11:30 a.m.
Please see the program for more details.






May 17 2019 11:30AM

Charles-Olivier Dufresne Camaro
Department of Computer Science
University of Toronto

Appearance Shock Grammar for Fast Medial Axis Extraction from Real Images


We combine ideas from shock graph theory with more recent appearance-based methods for medial axis extraction of complex natural scenes, allowing us to improve upon the present best unsupervised method, in terms of efficiency and performance. We make the following specific contributions: i) we extend the shock graph representation to the domain of real images, by generalizing the shock type definitions using local, appearance-based criteria; ii) we then use the rules of a Shock Grammar to guide our search for medial points, drastically reducing run time when compared to other methods, which exhaustively consider all points in the input image; iii) we remove the need for typical post-processing steps including thinning, non-maximum suppression, and grouping, by adhering to the Shock Grammar rules while deriving the medial axis solution.

The seminar will be presented at 11:30 a.m. in room PLT-1120.


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